Hi experts,
I have a simple file system and I would like to combine it with the SD card functions to read files from an SD card. SD card is using instance 1 so I think I should use MMCSD1.
first off, what clocks should I enable ? is it TISCI_DEV_MMCSD1_EMMCSDSS_XIN_CLK ? if yes, what should be its frequency? 200Mhz ? I'm saying this from the example in the SDK but it seems that example is for EMCC.
second, how can I change that example to make it read from an SD card instead of EMMC ? I'm referring to /examples/drivers/mmcsd/mmcsd_raw_io
please let me know how I can port this to use an SD card instead of EMMC.
Here is how ti_drivers_open_close looks like
/*
* MMCSD
*/
/* MMCSD Device Data structures */
MMCSD_EmmcDeviceData gEmmcData0;
/* MMCSD temporary data buffers */
uint8_t gMmcsdDataBuf0[512U] __attribute__((aligned(128U)));;
/* MMCSD Driver handles */
MMCSD_Handle gMmcsdHandle[CONFIG_MMCSD_NUM_INSTANCES];
/* MMCSD Driver Parameters */
MMCSD_Params gMmcsdParams[CONFIG_MMCSD_NUM_INSTANCES] =
{
{
.deviceData = &gEmmcData0,
.dataBuf = &gMmcsdDataBuf0[0],
},
};
void Drivers_mmcsdOpen(void)
{
uint32_t instCnt;
int32_t status = SystemP_SUCCESS;
for(instCnt = 0U; instCnt < CONFIG_MMCSD_NUM_INSTANCES; instCnt++)
{
gMmcsdHandle[instCnt] = NULL; /* Init to NULL so that we can exit gracefully */
}
/* Open all instances */
for(instCnt = 0U; instCnt < CONFIG_MMCSD_NUM_INSTANCES; instCnt++)
{
gMmcsdHandle[instCnt] = MMCSD_open(instCnt, &gMmcsdParams[instCnt]);
if(NULL == gMmcsdHandle[instCnt])
{
DebugP_logError("MMCSD open failed for instance %d !!!\r\n", instCnt);
status = SystemP_FAILURE;
break;
}
}
if(SystemP_FAILURE == status)
{
Drivers_mmcsdClose(); /* Exit gracefully */
}
return;
}
void Drivers_mmcsdClose(void)
{
uint32_t instCnt;
/* Close all instances that are open */
for(instCnt = 0U; instCnt < CONFIG_MMCSD_NUM_INSTANCES; instCnt++)
{
if(gMmcsdHandle[instCnt] != NULL)
{
MMCSD_close(gMmcsdHandle[instCnt]);
gMmcsdHandle[instCnt] = NULL;
}
}
return;
}
Thanks a lot,
Seyed
